title: [Residual effect of muscle strength exercise in secondary prevention of children obesity].
abstract: BACKGROUND
  The high prevalence of the obesity in Chilean students (23,1%), necessitates the application of interventions that incorporate muscle strength exercise, as this shows great efficacy in obese children.
  
  
  OBJECTIVE
  To evaluate the residual effect of muscle strength exercise on body fat, metabolic syndrome and physical fitness in obese schoolchildren.
  
  
  METHODS
  The sample included 111 obese schoolchildren, between 8 and 13 years, of 3 schools in the city of Santiago. Early intervention (n = 60) participated in parallel intervention that included muscle strength exercise, nutrition education and psychological support for 3 months. The late intervention (n = 51) incorporated the first 3 months, only the educational intervention and psychological support, and exercise was added between 3 and 6 months. At 9 months post intervention, we evaluated the residual effect of exercise. Body fat was determined by anthropometric equations. The metabolic syndrome was diagnosed by the criteria of Cook. Physical fitness was assessed by the distance walked in six minutes test.
  
  
  RESULTS
  The body fat percentage decreased at the end of the intervention and post intervention increased with the exception of the men of early intervention. The distance traveled increased at the end of the intervention but declined in the post intervention. Metabolic syndrome, decreased at the end of the intervention increased post intervention (p < 0,05).
  
  
  CONCLUSIONS
  The sustainability of the exercise is essential to maintain the changes, which is checked to determine the residual effect of exercise on body fat, metabolic syndrome and physical condition.
authors.affiliation: Facultad de Medicina, Universidad de Chile, Santiago, Chile. fvasquez@med.uchile.cl
authors.forename: Fabián
authors.initials: F
authors.lastname: Vásquez
authors.forename: Erik
authors.initials: E
authors.lastname: Díaz
authors.forename: Lydia
authors.initials: L
authors.lastname: Lera
authors.forename: Jorge
authors.initials: J
authors.lastname: Meza
authors.forename: Isabel
authors.initials: I
authors.lastname: Salas
authors.forename: Pamela
authors.initials: P
authors.lastname: Rojas
authors.forename: Eduardo
authors.initials: E
authors.lastname: Atalah
authors.forename: Raquel
authors.initials: R
authors.lastname: Burrows
mesh_terms: D050154:Adiposity / Q000502:physiology; D000293:Adolescent; D000886:Anthropometry; D001823:Body Composition / Q000502:physiology; D002318:Cardiovascular Diseases / Q000453:epidemiology; D002648:Child; D006801:Humans; D008297:Male; D024821:Metabolic Syndrome / Q000453:epidemiology / Q000517:prevention & control; D009043:Motor Activity / Q000502:physiology; D053580:Muscle Strength / Q000502:physiology*; D063766:Pediatric Obesity / Q000517:prevention & control* / Q000628:therapy; D010809:Physical Fitness; D055070:Resistance Training; D012307:Risk Factors; D055502:Secondary Prevention / Q000379:methods*